C公式无法得到正确的值

Question

我需要有关以下代码的公式的帮助:

#include <stdio.h>
void main()
{
    int MAGNUM, AK47, Knife, Axe, total;
    char choice, choice2, confirm;

    MAGNUM = 75;
    AK47 = 150;
    Knife = 40;
    Axe = 20;

    printf("Welcome to weapon store.\n");
    printf("Over here, we sell cheap weaponry you may be interested in.\n");
    printf("Currently, this is what we have for sale:\n\n\n");
    printf("(A) .44 MAGNUM\n");
    printf("(B) AK-47\n");
    printf("(C) Laredo Bowie knife\n");
    printf("(D) Tomahawk axe\n\n\n");
    printf("Pick one to buy, just type the letter in caps of the item and press enter.\n");
    printf("ITEM SELECTED:");
    scanf("%c", &choice);   //First input//

    if (choice == 'A')
    {
        printf("That will be $%d.\n", MAGNUM);
    }

    if (choice == 'B')
    {
        printf("That will be $%d.\n", AK47);
    }
    if (choice == 'C')
    {
        printf("That will be $%d.\n", Knife);
    }
    if (choice == 'D')
    {
        printf("That will be $%d.\n", Axe);
    }
    printf("Do you want to buy anything else?<Y//N>\n");    //Second input//
    scanf(" %c", &choice2);

    if (choice2 == 'Y')
    {
        printf("What else do you want to buy:");    //Third input//
        scanf(" %c", &confirm);
        if (confirm == 'A')
        {
            printf("That will be $%d.\n ", MAGNUM);
        }
        else if (confirm == 'B')
        {
            printf("That will be $%d.\n", AK47);
        }
        else if (confirm == 'C')
        {
            printf("That will be $%d.\n", Knife);
        }
        else if (confirm == 'D')
        {
            printf("That will be $%d.\n", Axe);
        }

        total = choice + confirm;   //Need help with formula here. total equals first input + third input//

        printf("Total cost is $%d. Thank you.\n", total);
    }
    else
    {
        printf("Thank you for shopping with us.\n");    
    }
}

调试时，它不会显示输入 1 和 3 加在一起时的正确值。

例如，如果我分别为输入 1 和 3 选择 D，然后再次选择 D，我总共应该得到 40 美元，但我却得到了不同的值 136 美元。

可能是我目前缺乏 C 知识，因为我才刚开始 2 天。这段代码只是我对 if else 语句等基础知识的测试，所以如果代码中的内容可能冒犯任何人，我深表歉意。

Answer 1

您添加的是字符值而不是价格。

68 是解释为整数的“D”。 68+68=136。

我会在您的 if 语句中添加价格，例如

if (choice == 'D')
{
printf("That will be $%d.\n", Axe);
total=total+Axe;
}